atomic structure

Question 1

what are the 5 main developments of the atom

Answer 1

1661- Boyle proposed there were substances that could not be made simpler (we now call these chemical elements)

1803- Dalton small solid spheres

1896- becquerel discovered radioactivity

1897- JJ Thompson discovered the plum pudding model

1911- Rutherford did the alpha particle scattering experiment and found most of the mass of an atom and the positive charge of the atom was in the nucleus